| A | B |
|---|
| solid | phase with definite shape and volume |
| liquid | phase with definite volume but no definite shape |
| gas | phase with no definite shape and no definite volume |
| plasma | phase where electrons are not bound around their atoms |
| volume | the space matter takes up |
| mass | the amount of matter in a substance or object |
| temperature | measure of the average kinetic energy of molecules |
| pressure | force exerted by the speed of molecules hitting a surface |
| melting | process where solids become liquids |
| freezing | process where liquids become solids |
| boiling | rapid escape of molecules from a liquid to a gaseous state |
| evaporation | slow escape of surface molecules from a liquid to a gas |
| Celsius | temperature scale where H2O freezes at 0 degrees; boils at 100 |
| Fahrenheit | temperature scale where H2O freezes at 32 degrees; boils at 212 |
| Kelvin | temperature scale where all motion stops at absolute zero |
| absolutezero | lowest possible temperature on the Kelvin scale |
| condensing | process where water vapor turns into a liquid |
| degree | unit of measurement in measuring temperature on Celsius and Fahrenheit scales |
